Find The Number Of Terms In The Arithmetic Sequence In Which A1= 2.5, D= 1.5 And An= 13

Find the number of terms in the arithmetic sequence in which a1= 2.5, d= 1.5 and An= 13

 

Step-by-step explanation:

Find n

an=13

a1=2.5

d=1.5

13=2.5+(n-1)(1.5)

13=2.5+1.5n-1.5

13=1.5n+1

12=1.5n

n=8

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